Function getFullScreenSizeInPixels

src/SFML/Main/MainAndroid.cpp:223–265

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void getFullScreenSizeInPixels(ANativeActivity& activity, int& width, int& height)
{
    // Perform the following Java code:
    //
    // DisplayMetrics dm = new DisplayMetrics();
    // getWindowManager().getDefaultDisplay().getRealMetrics(dm);

    JNIEnv& lJNIEnv = *activity.env;

    jobject objectActivity = activity.clazz;
    jclass  classActivity  = lJNIEnv.GetObjectClass(objectActivity);

    jclass    classDisplayMetrics  = lJNIEnv.FindClass("android/util/DisplayMetrics");
    jmethodID initDisplayMetrics   = lJNIEnv.GetMethodID(classDisplayMetrics, "<init>", "()V");
    jobject   objectDisplayMetrics = lJNIEnv.NewObject(classDisplayMetrics, initDisplayMetrics);

    jmethodID methodGetWindowManager = lJNIEnv.GetMethodID(classActivity,
                                                           "getWindowManager",
                                                           "()Landroid/view/WindowManager;");
    jobject   objectWindowManager    = lJNIEnv.CallObjectMethod(objectActivity, methodGetWindowManager);

    jclass    classWindowManager      = lJNIEnv.FindClass("android/view/WindowManager");
    jmethodID methodGetDefaultDisplay = lJNIEnv.GetMethodID(classWindowManager,
                                                            "getDefaultDisplay",
                                                            "()Landroid/view/Display;");
    jobject   objectDisplay           = lJNIEnv.CallObjectMethod(objectWindowManager, methodGetDefaultDisplay);

    jclass    classDisplay     = lJNIEnv.FindClass("android/view/Display");
    jmethodID methodGetMetrics = nullptr;

    // getRealMetrics is only supported on API level 17 and above, if we are below that, we will fall back to getMetrics
    if (getAndroidApiLevel(activity) >= 17)
        methodGetMetrics = lJNIEnv.GetMethodID(classDisplay, "getRealMetrics", "(Landroid/util/DisplayMetrics;)V");
    else
        methodGetMetrics = lJNIEnv.GetMethodID(classDisplay, "getMetrics", "(Landroid/util/DisplayMetrics;)V");
    lJNIEnv.CallVoidMethod(objectDisplay, methodGetMetrics, objectDisplayMetrics);

    jfieldID fieldWidthPixels  = lJNIEnv.GetFieldID(classDisplayMetrics, "widthPixels", "I");
    jfieldID fieldHeightPixels = lJNIEnv.GetFieldID(classDisplayMetrics, "heightPixels", "I");

    width  = lJNIEnv.GetIntField(objectDisplayMetrics, fieldWidthPixels);
    height = lJNIEnv.GetIntField(objectDisplayMetrics, fieldHeightPixels);
}


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